package classes_test

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	sitemap "git.golem15.com/golem15/sm-sitemap-plugin"
	"git.golem15.com/golem15/sm-sitemap-plugin/classes"
	"git.golem15.com/golem15/sm-sitemap-plugin/models"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/compass"
)

// TestTiers pins the priority tiers (D-13): each default rule of the PHP
// getPriorityForUrl with paths from its list, trailing slashes, the first
// match winning, the settings' values, tiers turned off, a host list that
// replaces the defaults, and a bad rule failing the plugin's Boot.
func TestTiers(t *testing.T) {
	tiers := pluginTiers(t)
	if len(tiers) != 5 {
		t.Fatalf("default rules = %d", len(tiers))
	}
	s := models.DefaultSettings()
	for url, want := range map[string]string{
		"https://h":                                 "1.0",
		"https://h/":                                "1.0",
		"https://h/en":                              "1.0",
		"https://h/en/":                             "1.0",
		"https://h/uslugi/strony-www":               "0.8",
		"https://h/en/services/web":                 "0.8",
		"https://h/realizacje/projekt/":             "0.8",
		"https://h/en/work/x":                       "0.8",
		"https://h/blog/kategoria/wpis":             "0.6",
		"https://h/en/blog/category/post/":          "0.6",
		"https://h/blog":                            "0.4",
		"https://h/blog/kategoria":                  "0.4",
		"https://h/uslugi":                          "0.4",
		"https://h/en/work":                         "0.4",
		"https://h/polityka-prywatnosci":            "0.2",
		"https://h/en/terms/":                       "0.2",
		"https://h/laboratorium-ai/zabawa-animacja": "0.2",
		"https://h/en/ai-lab/blob-playground":       "0.2",
		"https://h/kontakt?x=1":                     "0.2",
	} {
		if got, ok := tiers.Priority(url, s); !ok || got != want {
			t.Errorf("Priority(%s) = %q %v, want %s", url, got, ok, want)
		}
	}
	for _, url := range []string{"https://h/other", "https://h/blog/a/b/c", "https://h/uslugi/a/b", "https://h/en/blogs/x", "https://h/kontakt/more"} {
		if got, ok := tiers.Priority(url, s); ok {
			t.Errorf("Priority(%s) = %q, want no rule", url, got)
		}
	}
	custom := s
	custom.PriorityBlog = text("0.65")
	if got, _ := tiers.Priority("https://h/blog/a/b", custom); got != "0.65" {
		t.Fatalf("custom blog priority = %q", got)
	}
	off := s
	off.EnablePriorityTiers = false
	if _, ok := tiers.Priority("https://h/", off); ok {
		t.Fatal("tiers apply while turned off")
	}

	// First match wins: an exact rule listed before a pattern that also matches.
	ordered, err := classes.CompileTiers([]classes.TierConfig{
		{Setting: models.PriorityLegal, Exact: []string{"/blog"}},
		{Setting: models.PriorityCategories, Pattern: "^/blog$"},
	})
	if err != nil {
		t.Fatal(err)
	}
	if got, _ := ordered.Priority("https://h/blog/", s); got != "0.2" {
		t.Fatalf("first match = %q", got)
	}
	if empty, err := classes.CompileTiers(nil); err != nil || len(empty) != 0 {
		t.Fatalf("no rules = %v %v", empty, err)
	}
	if none, err := classes.LoadTiers(nil); err != nil || len(none) != 0 {
		t.Fatalf("LoadTiers(nil) = %v %v", none, err)
	}

	// Every refused rule names its index; a bad RE2 pattern too.
	for name, rule := range map[string]classes.TierConfig{
		"unknown setting": {Setting: "priority_other", Exact: []string{""}},
		"neither":         {Setting: models.PriorityHomepage},
		"both":            {Setting: models.PriorityHomepage, Exact: []string{""}, Pattern: "^/$"},
		"lookahead":       {Setting: models.PriorityBlog, Pattern: "^/(?=blog)"},
		"unbalanced":      {Setting: models.PriorityBlog, Pattern: "^/(blog"},
	} {
		_, err := classes.CompileTiers([]classes.TierConfig{{Setting: models.PriorityHomepage, Exact: []string{""}}, rule})
		if err == nil || !strings.Contains(err.Error(), classes.TiersConfigKey+"[1]") {
			t.Errorf("%s: err = %v", name, err)
		}
	}

	// A bad host rule fails the plugin's Boot.
	dir := t.TempDir()
	if err := os.WriteFile(filepath.Join(dir, "golem15.yaml"), []byte("sitemap:\n  priority_tiers:\n    - setting: priority_blog\n      pattern: '^/(blog'\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := compass.Open(compass.Options{Dir: dir, Environ: []string{}})
	if err != nil {
		t.Fatal(err)
	}
	p := &sitemap.Plugin{}
	if err := cfg.MergePlugin("golem15.sitemap", p.ConfigFS()); err != nil {
		t.Fatal(err)
	}
	if err := p.Boot(backpack.New(cfg)); err == nil || !strings.Contains(err.Error(), "priority_tiers[0]") {
		t.Fatalf("Boot with a bad pattern = %v", err)
	}
}